Interactive COVID-19 Visualization of United States

## generic imports
import altair as alt
import pandas as pd
from vega_datasets import data
import glob
from os import listdir,path
from pathlib import Path

counties = alt.topo_feature(data.us_10m.url, 'counties')
# used for world visualization later
#countries = alt.topo_feature(data.world_110m.url, 'countries')
source = data.unemployment.url